For a smartwatch with ECG, I’d start with the Samsung Galaxy Watch8 for a current Android-focused smart experience, while the Apple Watch Series 11 is the stronger fit for iPhone owners who want a larger choice of case sizes. The Galaxy Watch7 is a practical alternative if you want Samsung’s health tools in a previous generation. Your choice depends as much on phone compatibility and wrist fit as on ECG: Apple Watch models pair with iPhone, while Samsung’s ECG features depend on a compatible Samsung phone and regional availability. The listed Apple Watch SE 3 does not include ECG, so it is not a match for this specific search. Read on for the full comparison and the tradeoffs behind each pick.
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Key Takeaways
- Phone compatibility narrows the shortlist first: Apple Watch options are for iPhone users; Samsung ECG features require a compatible Samsung phone and may vary by region.
- The Galaxy Watch8 is the current Samsung lead pick: it suits buyers who want Samsung’s newer smart and health experience, while the Watch7 offers a previous-generation alternative.
- Apple Watch Series 11 is the ECG choice for iPhone owners: its 42mm and 46mm versions share the same core role, with size and fit driving the decision.
- The Apple Watch SE 3 does not provide ECG: its lower-tier position in the Apple lineup does not make it a substitute when an ECG app is required.
- ECG is a feature for spot checks, not a diagnosis: buyers should weigh how they will use the readings and discuss concerning results with a healthcare professional.
| watches with ecg | Connectivity | Model | Water resistance | Band |
|---|---|---|---|---|
| Samsung Galaxy Watch4 40mm Blu | Bluetooth, GPS | SM-R860NZKAXAA | — | — |
| Apple Watch Series 11 GPS 42mm | GPS; works with iPhone or Wi-Fi | MEU04LW/A | Up to 50m | Light Blush Sport Band, S/M |
| Samsung Galaxy Watch7 40mm Blu | Bluetooth | — | 50 meters | — |
| Samsung Galaxy Watch8 40mm Blu | Bluetooth | — | — | — |
| Apple Watch Series 11 GPS 46mm | GPS | Series 11 | 50m | Black Sport Band |
| Apple Watch Series 11 GPS 42mm | GPS | MEQT4LW/A | Up to 50m | Black Sport Band, S/M |
| Apple Watch SE 3 GPS 40mm Smar | GPS | Apple Watch SE 3 | Water resistant | Starlight Sport Band |
More Details on Our Top Picks
Samsung Galaxy Watch4 40mm Bluetooth Smartwatch, Black
The Galaxy Watch4 earns its place as a practical ECG pick for people who already use a compatible Galaxy phone: ECG readings are available through Samsung Health Monitor, alongside sleep, workout, heart-rate, blood-oxygen, and body-composition tracking. It also handles calls, texts, notifications, and music, so it can cover everyday smartwatch tasks without leaning on a newer model’s wellness features. Compared with the Galaxy Watch7, it lacks Energy Score and newer personalized guidance, but its automatic recognition for six activities makes routine workout tracking straightforward. The tradeoff is that ECG access depends on both phone compatibility and app setup, which narrows its appeal. I’d choose it for a Galaxy user seeking a broad set of smart and health tools; shoppers wanting fewer compatibility hurdles should look at the iPhone-focused Apple Watch Series 11 instead.
Pros:- ECG and multiple health metrics are available through Samsung Health Monitor on a compatible Galaxy phone
- Automatically recognizes six popular activities
- Tracks sleep, blood oxygen, heart rate, and body composition
- Supports calls, texts, notifications, and music
Cons:- ECG access depends on a compatible Galaxy phone and app setup
- Lacks the Galaxy Watch7’s Energy Score and personalized Wellness Tips
- Health measurements are not intended to diagnose or treat medical conditions
Best for: Galaxy phone owners who want ECG access alongside automatic workout recognition and everyday wrist notifications
Not ideal for: Android users without a compatible Galaxy phone, since ECG readings require Samsung Health Monitor on a supported device
- Model:SM-R860NZKAXAA
- Display size:40mm
- Color:Black
- Connectivity:Bluetooth, GPS
- Health features:ECG, heart rate, sleep, SpO2, body composition tracking
- Workout features:Automatic tracking for six activities, running coaching, VO2 Max
- ECG compatibility:Requires a compatible Galaxy phone
Our verdict“Choose the Galaxy Watch4 if you have a compatible Galaxy phone and want a versatile smartwatch with ECG and automatic workout tracking.”
Apple Watch Series 11 GPS 42mm Smartwatch with Rose Gold Aluminum Case and Light Blush Sport Band, S/M
The 42mm Apple Watch Series 11 is a strong smart choice for iPhone owners who want a compact watch with an always-on display and health and safety tools. Its listed features include sleep and heart-rate tracking, workout support, fall and crash detection, and emergency features; the supplied product details do not list ECG, so I would verify ECG support for this exact configuration before buying it specifically for that function. Compared with the Samsung Galaxy Watch4, it offers a clearer fit for iPhone users and adds fall and crash detection, while the Samsung listing explicitly names ECG but requires a compatible Galaxy phone. The Apple watch’s up to 24-hour battery life means regular charging is part of the routine. Its 50-meter water resistance and IP6X dust resistance suit active daily wear, but the iPhone or Wi-Fi requirement rules it out for Android buyers.
Pros:- Always-on display keeps information visible at a glance
- Fall and crash detection with emergency features
- Water resistance up to 50 meters and IP6X dust resistance
- Fast charging can provide up to eight hours of normal use in 15 minutes
Cons:- Requires an iPhone or Wi-Fi for connectivity
- Battery life is listed as up to 24 hours of normal use
- The supplied product details do not specify ECG support
Best for: iPhone owners who want a smaller always-on smartwatch with fall and crash detection and broad everyday connectivity
Not ideal for: Android users or buyers who need clearly confirmed ECG support from the supplied product details
- Model:MEU04LW/A
- Display:Always-on
- Case:42mm rose gold aluminum
- Band:Light Blush Sport Band, S/M
- Connectivity:GPS; works with iPhone or Wi-Fi
- Battery life:Up to 24 hours of normal use
- Water resistance:Up to 50m
- Dust resistance:IP6X
Our verdict“Pick this Series 11 for iPhone-focused safety and daily smartwatch features, but confirm ECG support if that is your deciding feature.”
Samsung Galaxy Watch7 40mm Bluetooth Smartwatch, Green
The Galaxy Watch7 suits Samsung users who value newer wellness guidance alongside a bright, compact display. Its Energy Score, personalized Wellness Tips, and built-in GPS give it a more coaching-oriented profile than the Galaxy Watch4, whose listing emphasizes automatic recognition of six activities and includes ECG through Samsung Health Monitor on a compatible Galaxy phone. The supplied Watch7 details do not mention ECG, so I would not choose it on the assumption that it provides ECG readings. Its 2000-nit OLED display and 50-meter water resistance make everyday viewing and active use more practical, while 32 GB of storage leaves room for apps and content. Compared with the Galaxy Watch8, this model’s standout information is its Samsung wellness scoring, but Samsung phone and account requirements apply to some features. That limits its usefulness for people outside the Samsung ecosystem.
Pros:- Built-in GPS supports location tracking during workouts
- Energy Score and personalized Wellness Tips add guidance beyond basic activity counts
- OLED display is rated for up to 2000 nits brightness
- Water resistance is listed to 50 meters
Cons:- Some features require a compatible Samsung Galaxy phone and account
- ECG support is not specified in the supplied product details
- Health features are not a substitute for medical diagnosis or treatment
Best for: Samsung phone owners who want GPS, sleep and workout tracking, and personalized wellness guidance on a compact watch
Not ideal for: Buyers whose main requirement is ECG, since the supplied product details do not specify ECG support
- Display size:40mm
- Display type:OLED
- Display resolution:480 × 480
- Maximum display brightness:2000 nits
- Connectivity:Bluetooth
- GPS:Built-in
- Water resistance:50 meters
- Storage:32 GB
Our verdict“Choose the Galaxy Watch7 for Samsung wellness insights and built-in GPS, but look elsewhere if ECG is essential.”
Samsung Galaxy Watch8 40mm Bluetooth Smartwatch, Graphite
The Galaxy Watch8 is the Android-oriented choice here for buyers who want guided running and a broad set of daily health features. Its Running Coach offers performance analysis and real-time feedback, while sleep guidance and an Energy Score extend its use beyond workouts. Blood pressure monitoring is listed too, but it requires a separately sold cuff and periodic calibration, so it is less self-contained than the Apple Watch Series 11’s listed health and safety package. The product details describe compatibility with Samsung and other compatible Android phones, giving it a wider stated phone fit than the Galaxy Watch4’s ECG setup, which specifically requires a compatible Galaxy phone. However, the supplied Watch8 description does not list ECG; I would confirm that feature before buying for ECG readings. Phone, app, account, internet, and GPS requirements can also limit access to some coaching and health functions.
Pros:- Running Coach provides performance analysis and real-time feedback
- Includes sleep guidance and Energy Score
- Works with Samsung and other compatible Android phones
- Lightweight design is intended for all-day comfort
Cons:- Blood pressure monitoring needs a separately sold cuff and periodic calibration
- Some features require a compatible Samsung phone, apps, accounts, or internet access
- The supplied product details do not specify ECG support
Best for: Android users who run outdoors and want real-time coaching plus sleep and health tracking
Not ideal for: ECG-focused shoppers unless they confirm ECG support for this model, or runners who do not want GPS setup and app dependencies
- Display size:40mm
- Connectivity:Bluetooth
- Color:Graphite
- Compatibility:Samsung and other compatible Android phones
- Warranty:2 years
- Health features:Sleep tracking, heart rate monitoring, blood pressure monitoring, Energy Score
- Running features:Running Coach with performance analysis and real-time feedback
Our verdict“Choose the Galaxy Watch8 for Android running coaching and daily guidance, after confirming ECG availability if you need it.”
Apple Watch Series 11 GPS 46mm Smartwatch with Jet Black Aluminum Case and Black Sport Band
The 46mm Apple Watch Series 11 is the larger-format choice for iPhone owners who want health tracking and safety features on a watch with an always-on display. Its supplied description specifically names ECG, sleep score, and hypertension alerts, giving it a clearer ECG case than the 42mm Series 11 entry, whose product details do not mention ECG. The larger size favors readers who want more screen area, while the 42mm version is the more compact option. Both listings point to up to 24 hours of battery life and fast charging, so the 46mm model does not remove the daily charging routine. It also includes fall detection and emergency assistance, plus 50-meter water resistance. This is a smart fit for Apple users seeking the listed ECG feature, but its GPS connectivity and Apple ecosystem focus make it a poor match for Android users.
Pros:- Product description explicitly includes ECG
- 46mm size provides a larger display format than the 42mm Series 11
- Includes sleep tracking, sleep score, and hypertension alerts
- Offers fall detection, emergency assistance, and 50-meter water resistance
Cons:- Limited to the Apple ecosystem and less compatible with Android devices
- Battery life is listed as up to 24 hours and may vary with intensive use
- The larger case may not suit buyers seeking a compact watch
Best for: iPhone owners who prefer a larger always-on display and want ECG, sleep tracking, and safety features
Not ideal for: Android users or buyers who prefer a smaller watch and do not need the 46mm display
- Model:Series 11
- Size:46mm
- Connectivity:GPS
- Case material:Jet Black Aluminum
- Band:Black Sport Band
- Water resistance:50m
- Display:Always-on
- Battery life:Up to 24 hours
Our verdict“Pick the 46mm Series 11 if you use an iPhone, want the explicitly listed ECG feature, and prefer a larger display.”
Apple Watch Series 11 GPS 42mm Smartwatch with Jet Black Aluminum Case and Black Sport Band (S/M)
The Series 11 is the strongest fit here for someone who wants ECG alongside a broad set of smart features. It adds heart rate alerts, Vitals metrics, sleep tracking, and a daily sleep score, while calls, texts, Siri, and notifications keep it useful beyond health checks. Compared with the Apple Watch SE 3, this model’s listed feature set makes ECG the clearer reason to choose it; the SE 3 is a simpler everyday option and its supplied data does not list ECG. The 42mm aluminum case and sport band suit daily wear, and 50-meter water resistance plus IP6X dust resistance support active use. The tradeoff is charging: up to 24 hours of normal use means most buyers will need a regular charging routine. Connectivity also depends on an iPhone or Wi-Fi.
Pros:- ECG plus heart rate alerts and Vitals metrics
- Sleep tracking includes a daily sleep score
- Fall and crash detection with emergency assistance features
- 50-meter water resistance and IP6X dust resistance
Cons:- Up to 24 hours of normal use calls for frequent charging
- Connectivity requires an iPhone or Wi-Fi
Best for: iPhone owners who want ECG, sleep metrics, and everyday smartwatch connectivity in one watch
Not ideal for: Android users or buyers who want multi-day battery life without regular charging
- Model:MEQT4LW/A
- Case size:42mm
- Case material and color:Jet black aluminum
- Band:Black Sport Band, S/M
- Connectivity:GPS
- Water resistance:Up to 50m
- Dust resistance:IP6X
- Battery life:Up to 24 hours of normal use
- Compatibility:iPhone or Wi-Fi
Our verdict“Choose the Series 11 if ECG and a full set of iPhone-connected smart and health tools matter more than multi-day battery life.”
Apple Watch SE 3 GPS 40mm Smartwatch with Starlight Aluminum Case and Sport Band
The SE 3 suits buyers who want a straightforward Apple smartwatch for fitness, safety, and daily notifications. It has an always-on display and fast charging, but the supplied product details do not list ECG. That makes the Series 11 the better match for this ECG-focused roundup; choose the SE 3 when everyday smartwatch basics matter more than a documented ECG feature. Its 40mm case is a compact alternative to the Series 11’s 42mm size, while fall detection and emergency assistance add practical safety tools. Battery life is listed at up to 18 hours, shorter than the Series 11’s up to 24 hours, so frequent charging is part of the deal. Full functionality requires an iPhone, and buyers seeking the higher-end model’s broader health feature set should look elsewhere.
Pros:- Always-on display for quick time checks
- Fast charging is listed as up to 2x faster than SE 2
- Fitness monitoring and safety features include fall detection and emergency assistance
- Compact 40mm aluminum case with matching sport band
Cons:- ECG is not listed in the supplied product details
- Up to 18 hours of battery life may require daily charging
- Requires an iPhone for full functionality
Best for: iPhone owners seeking a compact watch for everyday fitness tracking, notifications, and safety features who do not need ECG
Not ideal for: Buyers specifically seeking ECG readings or longer battery life; the supplied details do not list ECG and battery life is up to 18 hours
- Model:Apple Watch SE 3
- Case size:40mm
- Connectivity:GPS
- Case material:Starlight aluminum
- Band:Starlight Sport Band
- Battery life:Up to 18 hours
- Charging speed:Up to 2x faster than SE 2
- Water resistance:Water resistant
Our verdict“Pick the SE 3 for compact everyday Apple Watch features, but choose the Series 11 if ECG is a requirement.”
How We Picked
I ranked these watches by how well they meet the specific need for on-wrist ECG, then by smart features, phone compatibility, fit options, and generation. That puts the Galaxy Watch8 and Apple Watch Series 11 at the front for buyers seeking current smartwatches with ECG, with the right lead pick depending on whether the buyer uses Android or iPhone. The 42mm and 46mm Apple Watch Series 11 models serve different fit preferences rather than different ECG roles.
The Galaxy Watch7 and Watch4 follow as older Samsung options, with age and support life affecting their appeal alongside feature fit. I placed the Apple Watch SE 3 last because it lacks ECG, even though it may suit someone who wants basic Apple smartwatch functions. ECG availability can depend on phone, region, software, and local authorization, so I treat compatibility as part of the buying decision rather than assuming the feature works everywhere.
| watches with ecg | Model | Connectivity | Band | Battery life |
|---|---|---|---|---|
| Samsung Galaxy Watch4 40mm Blu | SM-R860NZKAXAA | Bluetooth, GPS | — | — |
| Apple Watch Series 11 GPS 42mm | MEU04LW/A | GPS; works with iPhone or Wi-Fi | Light Blush Sport Band, S/M | Up to 24 hours of normal use |
| Samsung Galaxy Watch7 40mm Blu | — | Bluetooth | — | — |
| Samsung Galaxy Watch8 40mm Blu | — | Bluetooth | — | — |
| Apple Watch Series 11 GPS 46mm | Series 11 | GPS | Black Sport Band | Up to 24 hours |
| Apple Watch Series 11 GPS 42mm | MEQT4LW/A | GPS | Black Sport Band, S/M | Up to 24 hours of normal use |
| Apple Watch SE 3 GPS 40mm Smar | Apple Watch SE 3 | GPS | Starlight Sport Band | Up to 18 hours |
Factors to Consider When Choosing Watches With Ecg
Before choosing a model, I’d confirm that the ECG function will work with your phone and in your region. Then weigh how often you expect to use it against everyday needs such as comfort, screen size, and battery routine. These checks help avoid buying a capable smartwatch whose most important health feature is unavailable to you.
Check Phone and Regional Compatibility
Start with the phone you already own, since Apple Watch models are designed for iPhone and Samsung ECG availability is tied to compatible Samsung phones. A watch may advertise an ECG app while access still depends on your country, software version, or local regulatory approval. Check the manufacturer’s current compatibility page for your exact phone and location before buying. A common mistake is to assume that Bluetooth pairing alone unlocks every health feature. If you plan to change phones soon, factor in the cost and effort of switching ecosystems as well as the watch itself.
Know What an ECG Reading Can Tell You
Wrist ECG is intended to capture a single-lead reading, often when you initiate a measurement, and it does not replace a clinical electrocardiogram. It can be useful for recording a rhythm during symptoms and sharing the result with a clinician, but a normal reading cannot rule out every heart problem. Read the app’s instructions so you know when to sit still, place a finger on the crown or sensor, and save a usable recording. Avoid choosing a watch on the assumption that it continuously detects every rhythm issue. For urgent symptoms such as chest pain or fainting, seek medical help rather than waiting for a watch reading.
Choose a Case Size for Daily Wear
Case size affects more than appearance: it changes screen area, how readable health prompts are, and how comfortably the watch sits during sleep or exercise. A smaller model can be easier to wear overnight, while a larger display can make notifications and workout details easier to scan. Try to judge fit by your wrist and band range, not by the case number alone. Buyers sometimes choose the biggest case for visibility and then wear the watch less because it feels cumbersome. Since the 42mm and 46mm Series 11 models share the ECG role, fit is the more useful distinction between them.
Balance Newer Features Against Support Life
Newer generations are more likely to offer the current software experience and a longer runway for updates, while an older model may still cover core smartwatch needs. For a health feature you intend to rely on over several years, update support and continued app availability matter alongside the sensor. Check the manufacturer’s support guidance for any older watch before choosing it. A frequent buying error is comparing only the feature list and overlooking how long the device may receive software updates. The Watch4’s age makes that question especially relevant next to the Watch7 and Watch8.
Decide Whether ECG Is a Requirement
If ECG is the reason you are shopping, verify that the exact model includes the ECG app before comparing colors, bands, or other smart features. The Apple Watch SE 3 is a useful example: it belongs to Apple’s smartwatch family but does not meet the ECG requirement. If ECG is only a nice-to-have, a model without it may still make sense for notifications, activity tracking, and everyday convenience. Don’t let a familiar brand name stand in for checking the specific sensor and app list. Write down your must-have features first, then compare watches that satisfy them.
Plan for Charging and Band Comfort
Smartwatch upkeep includes charging, keeping software current, and wearing a band that stays comfortable through the day. Charging patterns can affect whether you wear the watch overnight, which matters if sleep tracking is part of your routine. Consider when you can consistently recharge it, such as during a shower or desk break. A band that fits poorly can also interfere with consistent sensor contact during readings. Look up the included band’s size range and replacement options before settling on a case variant.
Frequently Asked Questions
Will these watches take an ECG if I use an Android phone?
Apple Watch Series 11 and SE 3 require an iPhone, so they are not suitable companions for Android phones. Samsung Galaxy Watch models pair with Android, but Samsung ECG access is limited to compatible Samsung phones and supported regions. Check the exact phone model and local availability in Samsung’s current guidance before purchasing. A watch can still handle some general functions when paired broadly, while ECG remains unavailable. If ECG is the deciding feature, confirm the app works before choosing based on design or other sensors.
Can the Apple Watch SE 3 record an ECG?
No, the Apple Watch SE 3 does not include the ECG feature. It can be a reasonable choice for an iPhone owner who wants core smartwatch functions, but it does not satisfy a requirement for ECG readings. In this lineup, the Apple Watch Series 11 models are the Apple options to compare for ECG. Check the product’s current technical specifications before purchase in case a listing mixes details from different models. If ECG is essential, don’t treat the SE 3 as a lower-cost equivalent.
Is the Galaxy Watch4 still a sensible ECG choice?
The Galaxy Watch4 has ECG capability in supported configurations, but it is an older generation than the Watch7 and Watch8. Its age makes current software support, app compatibility, and remaining device life key questions. Confirm that Samsung still supports the features you need in your region and with your phone. A newer watch may be the better fit if you want a longer period of updates or a more current smart experience. The Watch4 makes most sense for someone comfortable checking those support details before choosing an older model.
Should I choose the 42mm or 46mm Apple Watch Series 11?
Choose based on wrist fit, display preference, and the band size that suits you; both listed sizes provide the Series 11 ECG role. The 42mm case is the more compact option and may feel easier to wear overnight or on a smaller wrist. The 46mm version gives you a larger screen, which can make text and controls easier to see. Neither case size turns ECG into continuous monitoring, so size should be a comfort decision rather than a health capability decision. If possible, try the case on before committing to a band and size.
Does a smartwatch ECG replace a doctor’s heart test?
No. A smartwatch ECG is a consumer tool for capturing a limited, single-lead recording and cannot replace a clinical ECG or medical assessment. It may give you a record to discuss with a clinician, especially if you capture it while experiencing symptoms. A normal result does not rule out all heart conditions, and an inconclusive result can happen for several reasons. Follow the watch’s guidance and seek medical care for concerning symptoms rather than relying on the device alone.
Conclusion
For best overall smart ECG use, I’d choose the Galaxy Watch8 if I use a compatible Samsung phone, or the Apple Watch Series 11 if I use an iPhone. The best value direction is the Galaxy Watch7 for Samsung owners who are comfortable with a previous generation; I’d consider the Watch4 only after checking software support. For a premium Apple fit, pick the 46mm Series 11 for a larger display, while the 42mm version is the better compact choice. The best pick for beginners who want ECG is the Series 11 in the case size that feels comfortable, provided they have an iPhone. Choose the Apple Watch SE 3 only if ECG is not required; its feature set does not meet this roundup’s central need.
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